Construction device of frozen soil wall enclosing curtain structure and construction method thereof

Abstract

The invention relates to the technical field of building waterproof structures, and provides a construction device of a frozen soil wall enclosure curtain structure and a construction method thereof.The construction device comprises a side wall construction sub-device and an end wall construction sub-device, the side wall construction sub-device comprises a side wall injection pipe, and the side wall injection pipe is provided with two rows of side wall injection holes; the spacing angle between the two rows of side wall jet holes is 90 degrees or 180 degrees; the end wall construction sub-device sequentially comprises an end wall injection pipe, an end wall injection head and an injection head fixator from the near end to the far end. The far end of the injector head fixer is fixedly connected with external soil when being in contact with the external soil; the end wall spraying head is provided with a plurality of rows of end wall spraying holes, and the interval angles of any two adjacent rows of end wall spraying holes are equal. The end wall injection pipe is in a hollow pipe shape. Through the configuration, the cement-based or chemical slurry is orderly diffused in the space enclosed by the frozen soil wall, so that a perfect and waste-avoiding anti-leakage filling effect is achieved by utilizing a limited amount of grouting material in the closed space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building waterproof structure, and particularly relates to a construction device of a frozen soil wall enclosing curtain structure and a construction method thereof. BACKGROUND

[0002] In the field of building, in order to prevent water in the surrounding environment soil from seeping into the underground part of the building, it is usually necessary to perform a curtain grouting process between the soil and the wall to form a continuous water-blocking curtain. Specifically, in order to perform the curtain grouting process, first, a wall hole in a plum blossom configuration is arranged on the wall, and slurry is injected into the soil through the wall hole, and the slurry spreads in the soil, thereby forming a bulge-shaped structure. However, since no related structure for stopping the slurry is arranged in the soil outside the wall, in fact, the outermost position of the bulge-shaped structure usually has a more serious material waste phenomenon. This is because the part of the slurry that is expected to form and actually plays a role in blocking water seepage only includes the part spreading on the outer surface of the wall, and the rest of the slurry of the bulge-shaped structure is redundant. In addition, the formation of the bulge-shaped structure by means of the curtain grouting process puts quite high requirements on the experience and operation skill of the site construction personnel, and therefore the process is not universally applicable to the general construction personnel.

[0003] Moreover, the traditional solution cannot uniformly fill the slurry to the target area; in addition, the spacing of the wall holes / grouting holes is too large, and the grouting pressure is insufficient, which is easy to form local unfilled cavities. Such disordered diffusion not only destroys the integrity of the curtain, but also causes a large amount of slurry waste, directly increasing the construction cost. SUMMARY

[0004] The present application provides a construction device of a frozen soil wall enclosing curtain structure and a construction method thereof, to solve the defects that the traditional curtain grouting process in the prior art causes a large amount of slurry waste outside the wall and is easy to form local cavities, and to realize a construction device and a construction method thereof that clearly define the space range of the curtain structure to prevent the injected slurry from diffusing disorderly.

[0005] According to a first aspect of the present application, a construction device of a frozen soil wall enclosing curtain structure is provided, comprising a side wall construction sub-device and an end wall construction sub-device, wherein The side wall construction sub-device comprises a side wall jetting pipe, the side wall jetting pipe is formed as a hollow pipe, and has two rows of side wall jetting holes arranged along the length direction of the side wall jetting pipe, and the spacing angle of the two rows of side wall jetting holes is 90° or 180° in the radial cross section of the side wall jetting pipe; The end wall construction sub-device comprises, from proximal end to distal end, an end wall jetting pipe, an end wall jetting head and a jetting head fixer; the jetting head fixer is fixedly connected with the end wall jetting head, and the end wall jetting head is connected with the end wall jetting pipe; the distal end of the jetting head fixer is fixedly connected with the external soil when contacting the external soil; the end wall jetting head has a plurality of rows of end wall jetting holes arranged along the length direction of the end wall jetting head, and the spacing angle of any two adjacent rows of end wall jetting holes is equal in the radial cross section of the end wall jetting head; and the end wall jetting pipe is formed as a hollow pipe.

[0006] The construction device for the frozen soil wall enclosing curtain structure comprises an end wall jetting pipe, an end wall jetting head and a jetting head fixer. The connection between the end wall jetting head and the end wall jetting pipe is detachable, and the detachment mode is different from the detachment mode of the transition section from the main body section.

[0007] The construction device for the frozen soil wall enclosing curtain structure comprises an end wall jetting pipe, an end wall jetting head and a jetting head fixer.

[0008] The construction device for the frozen soil wall enclosing curtain structure comprises an end wall jetting pipe, an end wall jetting head and a jetting head fixer. The proximal end opening of each copper wire conveying channel is in fluid communication with the high-pressure gas source or the high-pressure refrigerant source.

[0009] The construction device for the frozen soil wall enclosing curtain structure comprises an end wall jetting pipe, an end wall jetting head and a jetting head fixer. The connection interface between the first section and the second section is provided with a corresponding gas overflow port leading to each copper wire conveying channel.

[0010] The construction device for the frozen soil wall enclosing curtain structure comprises an end wall jetting pipe, an end wall jetting head and a jetting head fixer.

[0011] The construction device for the frozen soil wall enclosing curtain structure comprises an end wall jetting pipe, an end wall jetting head and a jetting head fixer.

[0012] The construction device for the frozen soil wall enclosing curtain structure according to the present application, the end wall construction sub-device further comprises an end wall cooling device, which is arranged in the end wall injection pipe and sequentially comprises an end wall refrigerant conveying pipe and an end wall refrigeration spiral pipe from the proximal end to the distal end. The end wall refrigerant conveying pipe is detachably connected with the end wall refrigeration spiral pipe. The length of the end wall refrigeration spiral pipe is equivalent to the transverse thickness of the to-be-formed frozen soil end wall.

[0013] The construction device for the frozen soil wall enclosing curtain structure according to the present application, the fluid injected from the side wall injection hole and the end wall injection hole is a mixture of water, graphite powder and polyoxyethylene sorbitan monooleate.

[0014] According to the second aspect of the present application, a construction method for the frozen soil wall enclosing curtain structure is also provided, which is implemented by using the construction device for the frozen soil wall enclosing curtain structure according to the first aspect of the present application and comprises at least the following steps: The side wall construction sub-device and the end wall construction sub-device are inserted into the soil through the corresponding wall holes; The fluid mixture is supplied to the side wall construction sub-device and the end wall construction sub-device, so that the fluid mixture is injected from the side wall injection hole and the end wall injection hole, respectively; The side wall injection pipe is completely pulled out from the proximal end, and the end wall injection pipe is pulled out by a specific distance from the proximal end; The side wall cooling device is inserted into the original position of the side wall injection pipe, and the end wall cooling device is inserted into the end wall injection pipe until the end wall refrigeration spiral pipe is pulled out from the transition section; The refrigerant is supplied to the side wall cooling device and the end wall cooling device; The side wall cooling device and the end wall refrigerant conveying pipe are completely pulled out from the proximal end, respectively; The slurry is injected into all the wall holes.

[0015] The construction method for the frozen soil wall enclosing curtain structure according to the present application, the step of pulling out the end wall injection pipe from the proximal end by a specific distance further comprises: The high-pressure gas or the refrigerant is supplied to each copper wire conveying channel of the sleeve until the sliding block moves to the distal end beyond the corresponding gas overflow port.

[0016] The construction method for the frozen soil wall enclosing curtain structure according to the present application, the step of pulling out the end wall injection pipe from the proximal end by a specific distance further comprises: The high-pressure gas or the refrigerant is supplied to each copper wire conveying channel of the sleeve until the single copper wire is pulled out from the copper wire conveying channel; The end wall injection pipe is rotated, wherein the rotation angle of the end wall injection pipe is less than the interval angle of the adjacent two copper wire conveying channels; The above steps are repeated until the horn-shaped assembly composed of a plurality of radially outwardly extending copper wires is formed.

[0017] The construction device for the frozen soil wall enclosure curtain structure provided by this invention exchanges heat (or cold) with the soil on the outside of the wall through a refrigerant (e.g., liquid nitrogen), allowing the water (i.e., the main component in the fluid mixture) sprayed by the side wall spray pipe / end wall spray head to fully mix with the soil and freeze, thereby forming a closed frozen soil wall. Then, grout is injected into the soil inside the frozen soil wall. The grout diffuses in the soil, presenting a block-shaped solid structure rather than a typical bulging structure. This frozen soil wall enclosure curtain structure can increase the utilization rate of grout. Moreover, unlike the disordered diffusion of grout in the soil in traditional processes, in this invention, the grout diffuses orderly from bottom to top in the closed space enclosed by the frozen soil wall. Therefore, within the closed space, a perfect and waste-free seepage-proof filling effect is achieved using a limited amount of grouting material. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the end face and side face of the frozen soil wall enclosure curtain structure provided by the present invention.

[0020] Figure 2 This is a flowchart of the construction method for the frozen soil wall enclosure curtain structure provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the end-wall construction sub-device provided by the present invention and a radial cross-sectional view of the end-wall spray head.

[0022] Figure 4 This is a schematic diagram of the end-wall injection head and end-wall injection pipe separated from each other, provided by the present invention.

[0023] Figure 5 This is a schematic diagram showing the state of the copper wire extending from the copper wire delivery channel provided by the present invention.

[0024] Figure 6 yes Figure 5 A schematic diagram of the construction device for the frozen soil wall enclosure curtain structure.

[0025] Figure 7 This is a schematic diagram of the end-wall cooler provided by the present invention being installed through the end-wall injection pipe.

[0026] Figure 8 yes Figure 7A schematic view of the end wall radiator.

[0027] Figure 9 A schematic view of the state of dismounting the end wall refrigerant delivery pipe.

[0028] Figure 10 A schematic view of the state of extracting the main body section of the end wall injection pipe.

[0029] Figure 11 A schematic view of the side wall construction sub-device and a sectional view of the radial section where the side wall injection hole is located.

[0030] Figure 12 A schematic view of the side wall radiator.

[0031] Reference signs: 1, soil; 2, end wall (of the frozen earth wall); 3, side wall (of the frozen earth wall); 4, wall body; 5, end wall construction sub-device; 6, side wall construction sub-device; 7, side wall injection pipe; 8, side wall injection hole; 9, end wall injection pipe; 10, end wall injection head; 11, end wall injection hole; 12, injection head fixer; 13, main body section; 14, transition section; 15, envelope; 16, first section; 17, second section; 18, copper wire delivery channel; 19, copper wire; 20, sliding block; 21, gas overflow port; 22, side wall radiator; 23, side wall refrigerant delivery pipe; 24, side wall refrigeration coil; 25, sealing member (of the side wall radiator); 26, shell (of the side wall radiator); 27, end wall radiator; 28, end wall refrigerant delivery pipe; 29, end wall refrigeration coil; 30, sealing member (of the end wall radiator); 31, shell (of the end wall radiator); 32, pressurized sealing member; 33, high-pressure interface. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for description purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "connected", "connected to", "connection" should be interpreted broadly, for example, can be fixedly connected, can also be detachably connected, wherein the fixedly connected can include the manner of integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature can be "under", "below" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0037] The construction device and construction method of the frozen soil wall enclosing curtain structure of the present application will be described below in combination with Figures 1 to 12

[0038] ​First, it needs to be noted that the construction principle of the frozen soil wall is that soil is a mixture of solid particles (including sand, clay, etc.), water, and air, and its overall thermal conductivity is low (about 0.1-1.0 W / (m·K)) and changes with the water content. The solid particles in the soil and the air in the pores hinder heat transfer, resulting in a significant slowdown in the cooling rate of the water. In contrast, water molecules can move freely and quickly form ice crystals and spread when they reach 0°C. At the same time, when water condenses into ice, it releases latent heat of phase change (about 334 kJ / kg), which can quickly transfer to the surrounding low-temperature environment without affecting subsequent freezing. In other words, the porous structure of the soil "retains" the latent heat of phase change, making it difficult for heat to dissipate quickly, causing the local temperature of the soil to rise, and delaying the freezing process. Therefore, powder made of cold (heat) conducting materials is mixed into the water, thereby improving the cold (heat) conducting performance of the fluid mixture, and increasing the freezing speed of the water (i.e., the main component of the fluid mixture). In a high-pressure (about 40 MPa) state, a water jet is sprayed onto the soil, and the freezing of water and soil is accelerated, thereby forming a frozen soil wall with a thickness of about 10 cm, which is a mixture of ice and soil and other substances.

[0039] Figure 1 The end and side views of the frozen soil wall enclosure curtain structure provided by the present application are shown in FIGS. 1 and 2, respectively. Figure 1 As shown in FIGS. 1 and 2, a frozen soil wall enclosure curtain structure needs to be formed on the outer side of the wall 4 to prevent water in the soil 1 from seeping into the underground part of the building. For example, the frozen soil wall enclosure curtain structure to be formed has a transverse dimension of about 0.5 m for the enclosed space formed by the frozen soil wall. In addition, the frozen soil wall includes an end wall 2 parallel to the wall 4 and side walls 3 located at the upper, lower, left, and right four directions of the enclosed space. As described above, to form the end wall 2 and the side walls 3 of the frozen soil wall, wall holes and soil holes that are in communication with each other need to be formed in the wall 4 and the soil 1, so that the end wall construction sub-device 5 and the side wall construction sub-device 6 are arranged in the wall holes and the soil holes, respectively.

[0040] Moreover, for the traditional quincunx-shaped wall hole arrangement in the curtain grouting process, the spacing between any two adjacent wall holes is about 0.5 m. In contrast, the spacing between any two groups of adjacent wall holes and soil holes in the present application is about 1.0 m, because the impact range of the water jet sprayed by the end wall construction sub-device 5 and the side wall construction sub-device 6 can reach about 1.0 m, thereby reducing the number of holes drilled in the wall 4.

[0041] Incidentally, since the frozen soil wall enclosure curtain structure needs to be formed on the outer side of the wall 4, in the following, the end relatively close to the wall 4 / located at one end of the wall 4 is defined as the proximal end, and the end relatively far from the wall 4 / located at one end of the soil 1 is defined as the distal end.

[0042] Figure 3is a schematic view of the end wall construction sub-device and a radial cross-sectional view of the end wall injection head provided by the present application, Figure 11 is a schematic view of the side wall construction sub-device and a cross-sectional view of the radial cross-section of the side wall injection hole provided by the present application, as shown in Figure 3 and Figure 11 The construction device (hereinafter referred to as "construction device") for the curtain structure of the frozen earth wall comprises an end wall construction sub-device 5 and a side wall construction sub-device 6.

[0043] The side wall construction sub-device 6 comprises side wall injection pipes 7, which are formed as hollow tubes. The distal end of the side wall injection pipe 7 is provided as a closed end, while the proximal end is connected to a supply source of the fluid mixture (not shown in the figure). Each side wall injection pipe 7 has two rows of side wall injection holes 8 arranged along the length thereof, and the distance between any two adjacent side wall injection holes 8 is equal. In the radial cross-section of the side wall injection pipe 7, the angle between the distances of the two rows of side wall injection holes 8 is 90° or 180°. In combination with Figure 1 , the side wall injection pipe 7 with an angle of 90° is suitable for being arranged in the wall hole and the soil hole corresponding to the corner of the frozen earth wall, and the side wall injection pipe 7 with an angle of 180° is suitable for being arranged in the wall hole and the soil hole corresponding to the side wall 3.

[0044] The end wall construction sub-device 5 comprises, in sequence from the proximal end to the distal end, an end wall injection pipe 9, an end wall injection head 10, and an injection head fixer 12. The injection head fixer 12 is fixedly connected with the end wall injection head 10, and the end wall injection head 10 is connected with the end wall injection pipe 9, preferably in a detachable manner. After the wall body 4 and the soil 1 are drilled, the end wall construction sub-device 5 is inserted into the wall hole and the soil hole, and then a pushing force towards the distal end is continuously applied to the end wall construction sub-device 5, so that the end wall construction sub-device 5 continues to advance about 20 cm towards the distal end. Thus, the distal end of the injection head fixer 12 contacts the soil 1 and is fixedly connected therewith, specifically, firmly embedded in the soil 1.

[0045] The end wall injection head 10 has a plurality of rows of end wall injection holes 11 arranged along the length thereof, and the distance between any two adjacent end wall injection holes 11 is equal for each row of end wall injection holes 11. In the radial cross-section of the end wall injection head 10, the angle between the distances of any two adjacent rows of end wall injection holes 11 is equal. The end wall injection pipe 9 is formed as a hollow tube, and both ends thereof (i.e., the proximal end and the distal end) are provided as open ends, in particular, the proximal end can be connected to a supply source of the fluid mixture. For example, the end wall injection head 10 has eight rows of end wall injection holes 11, and the angle between the distances of any two adjacent rows of end wall injection holes 11 is 45°.

[0046] By the above configuration, the water sprayed by the side wall injection pipe 7 / end wall injection head 10 is mixed with the soil 1 and frozen by the cold exchange of the refrigerant with the soil 1 outside the wall 4, so as to be enclosed into a closed frozen soil wall, and then the slurry is injected into the soil 1 in the frozen soil wall, the slurry spreads in the soil 1 and presents a solid block shape. The curtain structure enclosed by the frozen soil wall can increase the utilization rate of the slurry, and the slurry spreads in the closed space from bottom to top in an orderly manner, which is different from the disordered spreading of the slurry in the soil 1 in the traditional process. Therefore, in the closed space, the limited amount of grouting material can achieve perfect and waste-free anti-seepage filling effect.

[0047] Further, the end wall injection pipe 9 comprises a main section 13 and a transition section 14 detachably connected to the distal end of the main section 13. For example, the main section 13 and the transition section 14 are connected to each other by threads. On the other hand, as mentioned above, the connection between the end wall injection head 10 and the end wall injection pipe 9 is detachable. For example, the end wall injection head 10 and the end wall injection pipe 9 are also connected to each other by threads. The detachment mode of the end wall injection head 10 and the end wall injection pipe 9 is different from the detachment mode of the transition section 14 and the main section 13. For example, in the perspective from the proximal end to the distal end, the threads of the end wall injection head 10 and the end wall injection pipe 9 are threads that are loosened in the clockwise direction, while the threads of the transition section 14 and the main section 13 are threads that are tightened in the clockwise direction.

[0048] By doing so, in the subsequent process of separating / detaching the end wall injection head 10 and the end wall injection pipe 9, and in the process of separating / detaching the transition section 14 and the main section 13, the separation / detachment of the corresponding components can be achieved by means of different rotation directions.

[0049] Figure 4 is a schematic view of the end wall injection head and the end wall injection pipe of the present application in a state of being separated from each other, as Figure 4 As shown, the end wall injection pipe 9 further comprises an envelope 15 sleeved on the circumferential outer surface thereof, so as to avoid the direct contact between the end wall injection pipe 9 and the soil 1, thereby protecting the end wall injection pipe 9 from being corroded by the substances contained in the soil 1. The envelope 15 comprises a first section 16 and a second section 17 that are separable from each other. In the length direction of the end wall injection pipe 9, the first section 16 corresponds to the main section 13 of the end wall injection pipe 9, and can even be regarded as being attached to the main section 13, thereby keeping the same action as the main section 13; the second section 17 corresponds to the transition section 14 of the end wall injection pipe 9, and can even be regarded as being attached to the transition section 14, thereby keeping the same action as the transition section 14. Of course, before the transition section 14 and the main section 13 are separated from each other, the first section 16 and the second section 17 also keep the same action.

[0050] Figure 5is a schematic view of the state that the copper conductor extends from the copper conductor conveying channel provided by the application, Figure 6 is Figure 5 is a schematic view of the axial direction of the construction device of the permafrost wall enclosure curtain structure as shown in Figures 5 to 6 As shown, the envelope 15 is provided with a plurality of copper conductor conveying channels 18 extending along the length direction thereof, for example, eight copper conductor conveying channels 18 in the present embodiment; of course, it is also feasible to provide other numbers of copper conductor conveying channels 18 in other embodiments. In the radial section of the envelope 15, the interval angle of any two adjacent copper conductor conveying channels 18 is equal, in other words, the interval angle is 45° in the case of the existing eight copper conductor conveying channels 18. Most of each copper conductor conveying channel 18 extends parallel to the length direction of the end wall injection pipe 9, so that the copper conductor 19 is smoothly moved from the proximal end to the distal end in the copper conductor conveying channel 18; however, the distal end opening of the copper conductor conveying channel 18 is inclined radially outward relative to the axial direction of the envelope 15, so that the copper conductor 19 is bent by the shaping of the inclined distal end opening at this position. Therefore, after the copper conductor 19 is completely extended from the copper conductor conveying channel 18, it presents a radially outwardly curved shape.

[0051] The proximal end opening of each copper conductor conveying channel 18 is in fluid communication with a high-pressure gas source or a high-pressure refrigerant source. Specifically, the proximal end of the envelope 15 is matched with a pressurized sealing member 32, and the pressurized sealing member 32 is provided with a high-pressure interface 33. Thus, the high-pressure gas source / high-pressure refrigerant source supplies high-pressure fluid to the pressurized sealing member 32, and the high-pressure fluid passes through the high-pressure interface 33 and the proximal end opening of the copper conductor conveying channel 18, and pushes the copper conductor 19 in the copper conductor conveying channel 18 to advance to the distal end until it is bent by the shaping of the inclined distal end opening and extends from the distal end opening.

[0052] As an example, the diameter of the copper conductor 19 can be set to about 1.5 mm, and the inner diameter of the copper conductor conveying channel 18 can be set to be slightly larger than the diameter of the copper conductor 19.

[0053] In an optional embodiment, each copper conductor conveying channel 18 is only loaded with a single copper conductor 19. The proximal end of the copper conductor 19 is provided with a sliding block 20, and in the radial section of the copper conductor conveying channel 18, the shape of the sliding block 20 matches the shape of the copper conductor conveying channel 18, in other words, the diameter of the sliding block 20 can be set to be slightly larger than the diameter of the copper conductor 19.

[0054] The connecting interface of the first section 16 and the second section 17 of the envelope 15 is provided with corresponding gas overflow ports 21 leading to the respective copper conductor delivery channels 18. In the case of eight copper conductor delivery channels 18, the outer surface of the envelope 15 is provided with the same number (i.e. eight) of gas overflow ports 21. As mentioned above, the high pressure fluid acts on the slider 20, thereby pushing the copper conductors 19 in the copper conductor delivery channels 18 to advance distally. During the distal advancement of the slider 20, the high pressure fluid overflows from the gas overflow ports 21 when the slider 20 passes the gas overflow ports 21. At this point, the fluid acting on the proximal face of the slider 20 is no longer maintained at high pressure, and the copper conductors 19 and the slider 20 no longer continue to advance distally, thereby being maintained in the current extended state.

[0055] In another alternative embodiment, each copper conductor delivery channel 18 is loaded with a number of copper conductors 19. The end wall injection pipe 9 is rotated by a certain angle each time, and each copper conductor delivery channel 18 outputs a single copper conductor 19. Similar to the previous embodiment, the proximal end of the copper conductor 19 can be provided with a slider 20; however, unlike the previous embodiment, the envelope 15 is not provided with corresponding gas overflow ports 21. In the case of eight copper conductor delivery channels 18, after a single batch of eight copper conductors 19 is extended, the end wall injection pipe 9 is rotated, and the envelope 15 rotates with the end wall injection pipe 9. Preferably, the rotation angle of the end wall injection pipe 9 is less than the angular spacing between adjacent two copper conductor delivery channels 18. After the rotation action of the end wall injection pipe 9 is completed, the high pressure fluid is again supplied to the eight copper conductor delivery channels 18 through the pressurizing seal 32, thereby pushing the next batch of eight copper conductors 19 to extend from the distal opening of the copper conductor delivery channels 18. By repeating the above operation, a horn-shaped assembly composed of a number of radially outwardly extended copper conductors 19 can be formed at the distal end of the end wall injection pipe 9, so as to assist in conducting cold (heat) in the subsequent freezing process, which will be described in detail below.

[0056] In the two alternative embodiments, the high pressure coolant can act as the propelling power medium of the copper conductors 19. Such high pressure coolant can be the coolant circulating back from the end wall coolant delivery pipe 28, which will be described in detail below.

[0057] Figure 12 is a schematic view of the side wall heat spreader provided by the present application, as Figure 12 The side wall heat spreader 22 is extended into the wall hole and the soil hole after the end wall injection pipe 7 is completely extracted / pulled out from the wall hole and the soil hole.

[0058] The side wall heat dissipator 22 comprises, in sequence from the proximal end to the distal end, a side wall coolant delivery pipe 23 and a side wall refrigeration coil 24, and the side wall coolant delivery pipe 23 and the side wall refrigeration coil 24 are connected to each other. For example, the side wall coolant delivery pipe 23 and the side wall refrigeration coil 24 are connected to each other in the form of insertion.

[0059] At the connection part of the side wall coolant delivery pipe 23 and the side wall refrigeration coil 24, a sealing member 25 is arranged, which further maintains the connection of the side wall coolant delivery pipe 23 and the side wall refrigeration coil 24 and prevents the coolant (for example, liquid nitrogen) supplied from the side wall coolant delivery pipe 23 from leaking at the connection part. Furthermore, the length section of the side wall coolant delivery pipe 23 close to the connection part is covered by a shell 26, and preferably, silica (SiO2) aerogel is filled between the side wall coolant delivery pipe 23 and the shell 26, so as to avoid the unnecessary dissipation of the cold energy of the coolant in the side wall coolant delivery pipe 23 and the cooling of the soil 1 at the length section of the side wall coolant delivery pipe 23.

[0060] The length of the side wall refrigeration coil 24 is equivalent to the lateral length of the side wall 3 of the to-be-formed frozen soil wall, for example, about 0.5 m.

[0061] Figure 7 is a schematic view of the end wall heat dissipator provided by the present application penetrating the end wall injection pipe, Figure 8 is Figure 7 is a schematic view of the end wall heat dissipator, as Figures 7 to 8 As shown in FIG. 6, the end wall construction sub-device 5 further comprises an end wall heat dissipator 27, which penetrates the end wall injection pipe 9 after the end wall injection pipe 9 is slightly extracted / withdrawn from the soil hole by a certain distance. The end wall heat dissipator 27 comprises, in sequence from the proximal end to the distal end, an end wall coolant delivery pipe 28 and an end wall refrigeration coil 29, wherein the end wall refrigeration coil 29 extends from the distal end of the end wall injection pipe 9 when the end wall heat dissipator 27 penetrates the end wall injection pipe 9. In addition, the end wall coolant delivery pipe 28 and the end wall refrigeration coil 29 are connected to each other, for example, in the form of insertion.

[0062] The end wall refrigerant delivery pipe 28 is detachably inserted into the end wall refrigeration coil 29. Similar to the side wall heat dissipator 22, at the connection part between the end wall refrigerant delivery pipe 28 and the end wall refrigeration coil 29 of the end wall heat dissipator 27, a sealing member 30 is arranged to further maintain the connection between the end wall refrigerant delivery pipe 28 and the end wall refrigeration coil 29 and prevent the refrigerant supplied from the end wall refrigerant delivery pipe 28 from leaking at the connection part. Further, the length section of the end wall refrigerant delivery pipe 28 close to the connection part is covered by a shell 31, and preferably, SiO2 aerogel is filled between the end wall refrigerant delivery pipe 28 and the shell 31 to avoid the refrigeration cold energy in the end wall refrigerant delivery pipe 28 from being wasted and the soil 1 from being cooled at the length section of the end wall refrigerant delivery pipe 28. Since most of the length section of the end wall refrigerant delivery pipe 28 is in the end wall injection pipe 9, the length of the shell 31 can be designed to be similar to the length of the end wall injection pipe 9.

[0063] The length of the end wall refrigeration coil 29 is equivalent to the lateral thickness of the end wall 2 of the to-be-formed frozen soil wall, for example, about 0.1 m.

[0064] Further, the fluid sprayed from the side wall injection hole and the end wall injection hole is a mixture of water, graphite powder and polyoxyethylene sorbitan monooleate. In particular, for the fluid mixture, the content of graphite powder is about 8 wt%, the content of polyoxyethylene sorbitan monooleate is about 0.3 wt%, and the remaining majority is water. The graphite powder plays a role of increasing the heat conduction of the fluid mixture so as to more rapidly conduct the cold energy of the side wall refrigeration coil 24 and the end wall refrigeration coil 29 to the soil 1 and the water in the soil 1, and make the water freeze into frozen soil wall more quickly; the polyoxyethylene sorbitan monooleate plays a role of uniformly distributing the graphite powder in the water, because the graphite powder is insoluble in water. The freezing speed of the fluid mixture containing the above components can be increased by more than 50% under the environment of -20℃, and the cost of the materials of various components is low and easy to obtain from the market.

[0065] Figure 2 is a flow chart of the construction method of the frozen soil wall enclosing curtain structure provided by the present application, as shown in Figure 2 The present application further provides a construction method of a frozen soil wall enclosing curtain structure (hereinafter referred to as “construction method” for short), which is realized by using the construction device as described above, and includes at least the following steps: Step S1, wall holes are formed at specific positions of the wall 4 of the underground part of the building, and the side wall construction sub-device 6 and the end wall construction sub-device 5 are inserted into the soil 1 through the corresponding wall holes; Step S2, supplying the fluid mixture to the side wall construction sub-device 6 and the end wall construction sub-device 5, so that the fluid mixture is ejected from the side wall ejection holes 8 and the end wall ejection holes 11, respectively; Step S3, completely extracting the side wall ejection pipe 7 from the proximal end, and extracting the end wall ejection pipe 9 from the proximal end by a certain distance; Step S4, inserting the side wall heat sink 22 into the original position of the side wall ejection pipe 7, and inserting the end wall heat sink 27 into the end wall ejection pipe 9 until the end wall refrigeration coil 29 extends out of the transition section 14; Step S5, supplying the refrigerant to the side wall heat sink 22 and the end wall heat sink 27; Step S6, completely extracting the side wall heat sink 22 and the end wall refrigerant delivery pipe 28 from the proximal end, respectively; Step S7, injecting the slurry into all the wall holes.

[0066] For step S1, the wall holes of the side wall 3 corresponding to the upper, lower, left and right four directions need to be opened on the wall body 4, and the wall holes for forming the end wall 2 also need to be opened. Here, although from the perspective of the construction personnel, they drill the holes from the wall body 4 outward, in fact, the soil 1 outside the wall body 4 also forms soil holes due to the drilling operation, which are in one-to-one correspondence with the wall holes and communicate with each other. Based on the required lateral length of the side wall 3 to be formed is about 0.5m, therefore, the lateral hole depth of the drilled soil holes is about 0.5m. After the drilling operation of the soil holes and the wall holes is completed, the side wall construction sub-device 6 and the end wall construction sub-device 5 are arranged into the corresponding soil holes and wall holes, thereby extending into the soil 1. Especially, for the end wall construction sub-device 5, it is also necessary to apply a pushing force to the end wall construction sub-device 5 towards the distal end, so that the end wall construction sub-device 5 continues to advance towards the distal end by about 20cm.

[0067] For step S2, the proximal end of each of the side wall construction sub-device 6 and the end wall construction sub-device 5 is fluidly connected to the supply source of the fluid mixture. Under the high pressure of 40MPa, the fluid mixture is ejected from the side wall ejection holes 8 and the end wall ejection holes 11, thereby spraying the water jet to the soil 1. In combination with Figure 3 and Figure 11 , the side wall construction sub-device 6 can shoot the fluid mixture in the form of a water jet to the soil 1 where the side wall 3 is to be formed, and the end wall construction sub-device 5 can shoot the fluid mixture in the form of a water jet to the soil 1 where the end wall 2 is to be formed. Moreover, for the end wall construction sub-device 5, during the ejection of the fluid mixture, the construction personnel turn (for example, by means of a wrench or the like tool) the end wall construction sub-device 5 in the underground part of the building, and the turning is not less than three turns, so as to ensure that the end wall ejection head 10 sprays the fluid mixture to the soil 1 around it.

[0068] For step S3, the side wall ejection pipe 7 is completely extracted from the proximal end; on the other hand, in combination with Figure 4The end-wall injection pipe 9 is pulled out a specific distance from the near end. Considering that the required lateral thickness of the end wall 2 is approximately 0.1m, this specific distance can be set to approximately 0.1m. As described above, from the near end to the far end, the threads of the end-wall injection head 10 and the end-wall injection pipe 9 are loosened clockwise, while the threads of the transition section 14 and the main body section 13 are tightened clockwise. Therefore, rotating the end-wall injection pipe 9 clockwise will release the threaded connection between the end-wall injection head 10 and the end-wall injection pipe 9.

[0069] For step S4, combined Figure 7 and Figure 12 Insert the sidewall cooler 22 into the original position of the sidewall injection pipe 7; extend the endwall cooler 27 into the endwall injection pipe 9 until the endwall cooling spiral tube 29 extends out from the transition section 14. In this way, the sidewall cooling spiral tube 24 of the sidewall cooler 22 almost comes into contact with the soil 1 that was originally in contact with the sidewall injection pipe 7 again; similarly, the endwall cooling spiral tube 29 extending from the transition section 14 also almost comes into contact with the soil 1 that was originally in contact with the endwall injection pipe 9 again. It should be noted that the soil 1 at this point already contains a fluid mixture.

[0070] In step S5, the sidewall refrigerant supply pipe 23 and the endwall refrigerant supply pipe 28 receive refrigerant, causing the sidewall cooling spiral pipe 24 and the endwall cooling spiral pipe 29 to cool rapidly. The soil 1 around the sidewall cooling spiral pipe 24 and the endwall cooling spiral pipe 29, which contains a fluid mixture, rapidly undergoes a cold (heat) exchange under the influence of the cold (heat) conductivity of the graphite powder, thereby causing the mixture of soil 1 and water to freeze rapidly into the endwall 2 and sidewall 3 of the frozen soil wall.

[0071] For step S6 Figure 9 This is a schematic diagram showing the state of the refrigerant delivery pipe after it has been removed from the end wall, as provided by the present invention. Figure 10 This is a schematic diagram of the main body section of the extraction end wall injection pipe provided by the present invention, as shown below. Figures 9 to 10 As shown, firstly, the end-wall refrigerant delivery pipe 28 is pulled out from the end-wall injection pipe 9. Due to the plug-in connection between the end-wall refrigerant delivery pipe 28 and the end-wall refrigeration spiral pipe 29, the end-wall refrigerant delivery pipe 28 disengages from the end-wall refrigeration spiral pipe 29 at the moment of extraction, remaining in the frozen soil wall. Then, the seal 30 and the outer casing 31 are extracted, for example, by rotating the outer casing 31 counterclockwise. Subsequently, the main body section 13 of the end-wall injection pipe 9 is rotated counterclockwise, thereby disengaging the threaded connection between the transition section 14 and the main body section 13. Thus, the main body section 13 of the end-wall injection pipe 9 can be extracted.

[0072] In addition, the sidewall cooler 22 can be completely extracted from the soil holes and wall holes.

[0073] For step S7, at this time, except for the spray head fixer 12, the transition section 14 and the end wall refrigeration coil 29 still remain in the frozen soil wall, the rest of the components of the construction device have been withdrawn from the soil hole and the wall hole. At this time, the slurry is injected into the enclosed space surrounded by the frozen soil wall through the wall hole. The slurry can be a cement-based slurry or a chemical slurry such as an acrylic salt. The way of injecting the slurry is from bottom to top, and the slurry will squeeze the unfrozen water in the soil 1 upwards, and these water will be discharged from the wall hole above, when the wall hole above overflows the slurry, the wall hole below is closed, and then the slurry is injected through the wall hole above.

[0074] Finally, the slurry spreads in the enclosed space surrounded by the frozen soil wall, and is restrained by the frozen soil wall and cannot flow deep into the soil 1. After the slurry solidifies, it together with the frozen soil wall forms the required frozen soil wall enclosed curtain structure.

[0075] In an alternative embodiment, the above-mentioned step S3 in the construction method further comprises: Step S311, supply high-pressure gas or refrigerant to each copper wire conveying channel 18 of the envelope 15 until the slider 20 moves to the distal end beyond the corresponding gas overflow port 21.

[0076] For step S311, each copper wire conveying channel 18 only loads a single copper wire 19, and preferably the proximal end of the copper wire 19 is provided with a slider 20. As described above, the high-pressure fluid (i.e. high-pressure gas or refrigerant) pushes the copper wire 19 to advance distally, when the slider 20 passes through the gas overflow port 21, the high-pressure fluid overflows from the gas overflow port 21, and the copper wire 19 and the slider 20 no longer continue to advance distally, thereby maintaining the current extended state. In combination Figure 6 , a horn-shaped assembly composed of eight copper wires 19 is formed.

[0077] In another alternative embodiment, the above-mentioned step S3 in the construction method further comprises: Step S321, supply high-pressure gas or refrigerant to each copper wire conveying channel 18 of the envelope 15 until a single copper wire 19 extends from the copper wire conveying channel 18; Step S322, rotate the end wall spray pipe 9, wherein the rotation angle of the end wall spray pipe 9 is less than the interval angle of the adjacent two copper wire conveying channels 18; Step S323, repeat the above-mentioned steps S321 and S322 until a horn-shaped assembly composed of a plurality of radially outwardly extending copper wires 19 is formed.

[0078] In the case of the existing eight copper conductor conveying channels 18, after a single batch of eight copper conductors 19 is extended, the end wall injection pipe 9 is rotated, and the sheath 15 rotates together with the end wall injection pipe 9. The rotation angle of the end wall injection pipe 9 is less than the interval angle of the adjacent two copper conductor conveying channels 18. After the rotation action of the end wall injection pipe 9 is completed, the high-pressure fluid is supplied to the eight copper conductor conveying channels 18 again through the pressurizing seal 32, so as to push the next batch of eight copper conductors 19 to extend from the distal end opening of the copper conductor conveying channel 18. By repeating the above operation, a horn-shaped assembly composed of more copper conductors 19 (compared with the previous optional embodiment) can be formed at the distal end of the end wall injection pipe 9.

[0079] Regardless of whether the horn-shaped assembly formed contains eight or more copper conductors 19, in the subsequent step S5, the cold energy of the refrigerant of the end wall refrigerant conveying pipe 28 is rapidly conducted to these copper conductors 19. At the same time, after these copper conductors 19 extend from the copper conductor conveying channel 18, they are inserted into the soil 1, and copper as a good heat-conducting material can thus assist in rapidly conducting the cold energy into the soil 1.

[0080] Moreover, after freezing through step S5, the copper conductors 19 are likely to be frozen in the frozen soil wall or the soil 1 near the frozen soil wall, and thus the second section 17 of the output copper conductor 19 and the corresponding transition section 14 act as anchor points. During the separation / detachment of the main section 13 and the transition section 14, the transition section 14 acts as an anchor point, and at this time, the screwing operation of the construction personnel on the main section 13 can release the threaded connection between the main section 13 and the transition section 14.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A construction device for a frozen soil wall enclosure curtain structure, characterized in that, It includes sidewall construction sub-units and endwall construction sub-units, among which The sidewall construction sub-device includes a sidewall spray pipe, which is formed as a hollow tube and has two rows of sidewall spray holes arranged along its own length. On its own radial cross section, the spacing angle between the two rows of sidewall spray holes is 90° or 180°. The end-wall construction sub-device comprises, from near to far, an end-wall spray pipe, an end-wall spray head, and a spray head holder; the spray head holder is fixedly connected to the end-wall spray head, and the end-wall spray head is connected to the end-wall spray pipe; the far end of the spray head holder is fixedly connected to the external soil when in contact with it; the end-wall spray head has several rows of end-wall spray holes arranged along its own length direction, and the spacing angle between any two adjacent rows of end-wall spray holes is equal on its own radial cross-section; the end-wall spray pipe is formed into a hollow tube shape.

2. The construction device for the frozen soil wall enclosure curtain structure according to claim 1, characterized in that, The end-wall injection pipe includes a main section and a transition section detachably connected to the distal end of the main section; The connection between the end-wall spray head and the end-wall spray pipe is detachable, and its disassembly method is different from the disassembly method of removing the transition section from the main body section.

3. The construction device for the frozen soil wall enclosure curtain structure according to claim 2, characterized in that, The end-wall injection pipe also includes a sleeve fitted on its circumferential outer surface. The sleeve includes a first section and a second section that are separable from each other. In the length direction of the end-wall injection pipe, the first section corresponds to the main body section, and the second section corresponds to the transition section.

4. The construction device for the frozen soil wall enclosure curtain structure according to claim 3, characterized in that, The envelope has several copper wire conveying channels extending along its own length. On its own radial cross section, the spacing angle between any two adjacent copper wire conveying channels is equal, and the far end opening of each copper wire conveying channel is inclined outward relative to the axial radial direction of the envelope. The near-end openings of each of the copper wire delivery channels are fluidly connected to a high-pressure gas source or a high-pressure refrigerant source.

5. The construction device for the frozen soil wall enclosure curtain structure according to claim 4, characterized in that, Each copper wire conveying channel is loaded with only a single copper wire, and a slider is provided at the near end of the copper wire. In its own radial cross section, the shape of the slider matches the shape of the copper wire conveying channel. The connection interface between the first segment and the second segment is provided with corresponding gas overflow ports leading to each of the copper wire delivery channels.

6. The construction device for the frozen soil wall enclosure curtain structure according to claim 4, characterized in that, Each of the copper wire conveying channels is loaded with several copper wires. Each time the end wall injection pipe rotates a specific angle, each of the copper wire conveying channels outputs a single copper wire.

7. The construction device for the frozen soil wall enclosure curtain structure according to claim 1, characterized in that, The sidewall construction sub-device also includes a sidewall cooler, which consists of a sidewall refrigerant delivery pipe and a sidewall refrigeration spiral pipe from near to far. The sidewall refrigerant delivery pipe and the sidewall refrigeration spiral pipe are connected to each other, and the length of the sidewall refrigeration spiral pipe is equivalent to the lateral length of the frozen soil sidewall to be formed.

8. The construction device for the frozen soil wall enclosure curtain structure according to claim 1, characterized in that, The end-wall construction sub-device also includes an end-wall cooler, which is installed through the end-wall injection pipe. From the near end to the far end, it includes an end-wall refrigerant delivery pipe and an end-wall refrigeration spiral pipe. The end-wall refrigerant delivery pipe and the end-wall refrigeration spiral pipe are detachably connected. The length of the end-wall refrigeration spiral pipe is equivalent to the lateral thickness of the frozen soil end wall to be formed.

9. The construction device for the frozen soil wall enclosure curtain structure according to claim 1, characterized in that, The fluid ejected from the sidewall injection holes and the endwall injection holes is a mixture of water, graphite powder, and polyoxyethylene dehydrated sorbitan monooleate.

10. A construction method for a frozen soil wall enclosed curtain structure, which utilizes the construction device for a frozen soil wall enclosed curtain structure according to any one of claims 1 to 9, characterized in that, Includes at least the following steps: Wall openings are made at specific locations in the underground wall of the building, and side wall construction sub-devices and end wall construction sub-devices are inserted into the soil through the corresponding wall openings; A fluid mixture is supplied to the sidewall construction sub-device and the endwall construction sub-device, such that the fluid mixture is ejected from the sidewall injection hole and the endwall injection hole, respectively. The sidewall spray nozzles are completely withdrawn from the near end, and the endwall spray nozzles are withdrawn from the near end a specific distance. Insert the sidewall radiator into the original position of the sidewall injection pipe, and extend the endwall radiator into the endwall injection pipe until the endwall cooling spiral tube extends out from the transition section. Refrigerant is supplied to the sidewall radiators and the endwall radiators; The sidewall radiator and the endwall refrigerant delivery pipe are completely pulled out from the near end, respectively. Inject grout into all wall holes.

11. The construction method of the frozen soil wall enclosure curtain structure according to claim 10, characterized in that, The step of withdrawing the end-wall injection pipe a specific distance from the proximal end further includes: High-pressure gas or refrigerant is supplied to each copper wire delivery channel of the envelope until the slider moves further away than the corresponding gas overflow port.

12. The construction method of the frozen soil wall enclosure curtain structure according to claim 10, characterized in that, The step of withdrawing the end-wall injection pipe a specific distance from the proximal end further includes: High-pressure gas or refrigerant is supplied to each copper wire delivery channel of the envelope until a single copper wire extends from the copper wire delivery channel; Rotate the end wall injection pipe, wherein the rotation angle of the end wall injection pipe is smaller than the spacing angle between two adjacent copper wire conveying channels; Repeat the above steps until a trumpet-shaped assembly is formed, consisting of several radially outward-extending copper wires.

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